<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
    ul {
        list-style: none;
    }
        .Container {
            width: 750px;
          
            margin: 0 auto;
        }
        .Container ul li {
            float: left;
            width: 93.75px;
            height: 30px;
            height: 30px;
            background-color: skyblue;
        }

         @media screen and (max-width:767px) {
            .Container {
                width: 100%;

            }
            .Container  ul li {
                width: 33.33%;
            }
        }

       /* @media screen and (min-width:768px) {
            .Container {
                width: 750px;
            }

        } */
    </style>
</head>

<body>
    <div class="Container">
        <ul>
            <li>导航栏</li>
            <li>导航栏</li>
            <li>导航栏</li>
            <li>导航栏</li>
            <li>导航栏</li>
            <li>导航栏</li>
            <li>导航栏</li>
            <li>导航栏</li>
            
           
        </ul>
    </div>
</body>

</html>